<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            background-color: #ff9a9a;
            display: flex;
            float: left;
            flex-wrap: wrap;
            align-content: center;
            justify-self: center;

            div {
                width: 80px;
                height: 80px;
                background-color: antiquewhite;
                margin: 10px;
            }
        }
    </style>
</head>

<body>
    <div style="width: 400px;height: 400px;">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>  <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>  <div></div>
        <div></div>
        <div></div>
        <div></div>
       
    </div>
</body>

</html>